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Investigations with pigs in the field of nutrition physiology for the evaluation of modified proteins 3. connection between the true and apparent nitrogen digestibility or absorption of amino acids up to the end of the small intestines and parameters of nitrogen metabolization


, : Investigations with pigs in the field of nutrition physiology for the evaluation of modified proteins 3. connection between the true and apparent nitrogen digestibility or absorption of amino acids up to the end of the small intestines and parameters of nitrogen metabolization. Archiv fuer Tierernaehrung 31(11-12): 763-770

Modified proteins were tested in absorption investigations with 8 pigs with ileocecal re-entrant cannulae. The apparent digestibility up to the end of the small intestines showed considerable differences between the feed proteins (77-93%). The same differences were observed with the apparent absorption of amino acids. The true N-digestibility or the true absorption of the amino acids in this section of the intestinal tract was similar with all proteins. The amount of endogenous N in the chyme at the end of the small intestines was related to the protein consumed. The amount of endogenous N in the chyme in the small intestines influences N-excretion in urine and thus the intermediate utilization of feed protein. From the viewpoint of nutrition physiology, the spun Vicia faba protein/casein (1:1) fibers (C) approximate best the value of casein (A). While the treatment of this mixed protein with dyaldehyde starch had a negligible effect on the ascertained parameters only, the treatment of the same protein with aluminium chloride diminished its value more. The isolated Vicia faba (B) was the poorest of the modified proteins tested.

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